The volume is muted, but I can't un-mute it because I am unable to click on any of the sound options because they are all "grayed out". The little box next to mute is checked and I cannot un-check it because it's grayed out. Nothing works when I plug in headphones or speakers or anything, and there is no red light glowing where you plug the headphones or speakers in.

Somehow the sound is muted. I don't seem to be able to unmute it. When I go to system oreferences and go to sounds, it shows the sound is muted, but the box that is checked is grey and won't respond to clicking.

When the sound on my MacBook is muted, and there should be a sound playing (FOR EXAMPLE: EMPTY TRASH), the speakers click. It is almost like the sound wants to play, but does not, instead with a click. This happens every time.

EDIT: It also clicks before it plays a sound too. This happens only when the speakers are not used for a long time. Like a few hours.

I'm running OS X 10.6.8 on a 2.7 GHz i7 Macbook Pro with a 250Gb Apple SSD TS256C.†Since last Autumn, after a problem that saw the SSD replaced by Apple and me needing to migrate my profile across from an older Macbook, every time the system shuts down it forgets my sound settings. So no matter how I set the sound before powering down it always chimes on start up.†It's entirely possible that this may be a problem from the migration, but I don't know how to rectify the issue.

A few days ago I noticed that my mac mini was on mute so I tried the shortcut keys on my key board and they don't do anything so I go to system preferences > sound and it shows the mute check box checked and grayed out and above in the drop-down box where you are suppose to select what the audio sources is, is empty it used to say internal speakers, line in, and line out.

Today I noticed a problem that has happened to many running 10.6.3. After a restart the sound volume goes to max and there is no sound from the internal speakers! In the sound pref it has changed from internal speakers to sound flower. What is causing this? No third party app that would need to install a driver are there like Avid media composer. I have tried restarts and smc resets no luck at all.

Today I tried to watch a video on my computer, and there was no sound. So I clicked the volume up button, and it doesn't change the level (there's a small "no" sign, the circle with the line through it, under where the volume level should be). In the menu bar, the volume control is now a light grey and I can't use it. Same with in system preferences. Any ideas on how to get volume to start working again or why it stopped?

i'm having this minor but annoying problem with Firefox. every now any then when I move my mouse over the volume button while I'm watching a Youtube video in order to get the volume bar to pop up, nothing happens. if i click repeatedly on the button and go crazy it will pop up, but it will not let me slide the volume bar up and down. i don't remember having this problem with Safari. it's sort of like the browser isn't recognizing my mouse cursor hovering over the volume area in order for it to trigger the bar to pop up, if that makes any sense.

The sound doesn't work! I turned on my laptop and there is no sound. When I press the up and down volume buttons, it's normal, but there is no noise. Also, there ISN'T a red light in my headphone jack.

This annoying bug is driving me crazy when I'm listening to music or watching a youtube video.It seems as if some process is interfering with sound output. I've already tried eliminating the problem by closing all apps, uninstalling perian, quicksilver, to no avail.¬†Is there anyway to see which processes are using sound output at any given time?¬†

I have an Intel-based iMac which I just upgraded two days ago from Snow Leopard to Lion (10.7.4).¬† I did an upgrade-in-place (as opposed to a fresh install) and did a software update after the installation completed.¬† I have my computer scheduled to wake up each morning at 6 a.m.¬† When it wakes up, the sound doesn't work unless I reboot the computer.¬† If I open up iTunes and try to play music, there is no sound (unless I reboot).¬† The song progress meter at the top of iTunes won't even move when I hit the play button.¬† When I open the Sound preference and click the Output tab, I do see the Headphone port and the output volume is set all the way up.

Brand new 27" i5 imac. This is my first Mac so trying to get to grips with the OS. Sound was working great until today when it now doesn't work with any apps or internet Youtube etc. Any ideas what could cause this to happen and how to fix it?

I have a late '08 MBP hooked up to a new 27" ACD, using a bluetooth apple keyboard and magic mouse. It's been working fine in all respects until I woke it up today. Everything is fine except the volume. If I tap volume up or down on the keyboard, there's serious latency (5-10 seconds) between me pressing the button and it showing the volume moving. Secondly (and more importantly), there's no sound at all (no matter what volume it's set at). I've already directed the sound through the monitor's speakers (like I said, everything was working just fine). I've tried rebooting, double-checking the sound settings, and disconnecting/reconnecting the bluetooth keyboard.

The volume seems to be on lock and no sound comes out of the computer speakers. If I go to the volume sign at the top of the page the volume meter is white and stuck at the top. If I press F5 and F4 it moves neither up nor down and underneath the volume bar there is a circle with a line in it, which I presume is mute. I have gone into system pref -sound -out put and thats stuck too. Also there is a red light on in the headphone socket.

out of the blue something weird started happening. When i would press the up and down volume keys on the keyboard, no sound is coming out. When i raise or lower the volume from the top status bar, that little click is audible, but when i press the up and down keys from the keyboard, no sound comes out. is this a hardware problem? will apple replace/fix this? could i have muted it or something or is this like i said, a hardware problem?

My macbook doesnt save the headphones volume, I've already saw a thread talking about it but they only sugested erasing plist files and reseting pram, done both even re-installed os x and nothing.. When I plug the headphones the volume get's set to 50% and it gets really loud

my laptop (macbook pro) doesn't turn on, because the battery doesn't work (may be because of moisture), and the 7 battery lights on the left side are off, and when I plug the charger in, the light on the magnetic socket turns on so dim ..

I have macbook pro And my mail has stopped working now. It worked fine a week ago . It doesn't check for new mails , even when I click on get new mail , there is no new mail. I tried to sign out and sign in again but that didn't work . I read few articles on the internet but they all said use the Mac OS X DVD and reinstall but I didn't get any DVD , all I got with my computer was a Manual.

I told myself not to do it. Don't update the Safari software to 4.0, you know how they always mess up these things. And yet, per accident I did. Of course Safari 4.0 doesn't work. Every time I open it, it shuts down. iChat also doesn't work anymore, and even the Dashboard shuts down every now and then. In addition, the computer feels incredibly slow. I can't download rapidshare links on iGetter anymore and everything just feels wrong. Countless threads have been opened on this matter with a variety of different problems for different people. Yet I have not read a proper solution. I have seen all kinds of technical solutions being offered but I'm not a computer wiz and I do not know the terms they use. I just want to go back to Safari 3.2 or at least the one before the 4.0 But I read that deleting Safari 4 and reinstalling 3.2 won't work because of a certain webkit that got installed with it, making it impossible to go back.

I'm a noob to the MBP. Just got it last month and still learning how to use it. Anyways, my volume and brightness button worked a few hours ago, now it doesn't work. When I tried lowering the volume it doesn't work. Then I tried using the play button to start my itunes and that doesn't work either. I don't know what I did wrong. How can I get it back?

My volume and brightness (both display and keyboard) buttons stopped working. I deleted front row out of the Applications folder and CoreServices folder. I rebooted and they started working again. Then I went and started streaming a movie on Netflix and now they aren't working. Any ideas?

The volume for my MacBook will only work if my headphones are plugged in. I've tried just about everything I could think of to fix the problem but it's still not working. I've tried blowing it out, wiggling the headphone jack, checking the sound settings from the system preferences. I've come to the conclusion that there is a problem with the sensor, but I wanted to find out if there is anything else I could try before taking it somewhere to get repaired.

With my new headphones (Sennheiser HD280-PRO) even the lowest volume is too high (even when using the extra levels using the option-key). It's just below the level where it'll be uncomfortable, but lower would still be preferred.

Does anyone know how I can get OS X to use a different scale? I have a MBP 4,1 with OS X 10.6.3.

So I've been following the MBP forum for their Audio Volume issues because we seem to have the same problem. Check out their issues here: [URL]

There is also an apple discussion here. [URL]

I have a Late 2008 MB running both Leopard and Boot Camp with Windows XP pro SP3. Under boot camp it uses the RealTek driver for the sound card. It is putting out very low volume. Many people have posted similar problems with Vista and windows 7.

Here's the test I did to confirm. I made a 1kHz test tone audio file and played it out of OS X. I connected the output of my headphone jack to a volt meter and measured a little over 1V or 1000mV. I switched to Windows and played the same file. This time I measured 280mV. This proves that the RealTek driver is not sufficient and does not measure up the full potential of the Macbook.

I've called apple on the issue and they say that it is not their problem and they do not support it. Even though they advertise that Windows is fully functional under boot camp. The solution for the MBP was that someone modified the INF driver file. Unfortunately, Apple uses a different chip in the MB and this solution will not work. I tried it.

Everyone knows that when you adjust the system volume of OS X you get a sound that says how loud or soft the sound is. My school is using a Mac to run the sound for the fall play and I need to disable this sound. I know it can be done, I read how in David Pouge's OS X Leopard: The Missing Manuel, but that's currently several miles away in south Philly at my sister's house.

Can anyone tell me how to disable that sound? I think it might be a Terminal command, but like I said, I can't remember and I can't check.